Filter



Nov. 13, 1928.

C. ST. C. BURNS FILTER Original Filed Jan. 25, 1926 INVENTOR WITNESSES BY y@ ATTORNEYS Patented Nov.. 13, -192..4

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application led January 23, 1926, Serial No.' 33,1108. Renewed September 281, 41928.

rllhis invention relates in general to filters,

and more particularly to continuous pressure lters. 4

The object of the inventionis to provide a filterwherein the filtering operation is carri ed out under pressure and yet is continuousby virtue of the fact that the separated solids which tend to retard filtration are automatically manner as not to interfere with the filtering operation, thereby avoiding interruption and a consequent waste of time. y

A further object is to provide a filter of this character and having this advantage, which is simple and durable in construction, reliable in operation, and easy and comparatively inexpensive to manufacture.

Other objects and advantages reside 1n certain novel features of the construction, arrangement and combination of parts which will be hereinafter more vfully described and particularly pointed out in the appended claims, reference beingv had to the accompanying drawing forming a part of thls speel- `fication, and in which:

Figure 1 is a View partly in section and artly in elevation showing .an apparatus embodymg the present invention,

Figure 2 is a detail View partly 1n sectlon and partly in elevation showing the balance discharge valve assembly,

Fi ure 3 is a fragmentary sec'tlonal view showing the filtering means, Figure 4 is a fragmentary perspective vlew showing the means for removing the excess solids from the filterin means, and I Figure 5ris a sectiona view on the h ne 5-5 of Figure I.

Referring to the drawings, the-numeral 1 designates a c lindrical tank having its uper end close by an end plate 2. To the lbwer end of the tank a short cylinder 1s suitably secure-d as at a. The tank l'provldes a filter chamber and the cylinder 3 provides a sludge chamber. The cylindrical wall-ofv the tank 1 is alined with layers of reticulated material-designated at 5 and' 6. The layers 5 and 6 may be of wire mesh or any other suitable filtering material, and these layers overlie filtrate discharge pipes 7 which are connected to the cylindrical body of the tank.

The liquid or fluid to be filtered is fed into discharged in such a novel and'ecient the tank 1 througha delivery or inlet pipe 8 after 1 t has been mixed in any'suitable man ner 'with a filtering medium which may be clay, fullers earth, bone char, filter cel or the like. This duid or liquid with the filtering medium dissolved therein is forced under pressure in through the "pipe, 8 into the tank 1. The ifiltering medium builds up on the inner layer '5 and the purified and .cleared fiuid or liquid passes out through the filtrate oEtake 'pipes 7.

For the purpose of removing the excess solids which build up on the inner layer 5, cleanlng means is provided for removing such f excess sollds and depositing them in the sludge chamber`3. This cleaning means includes a s shaft 10 rotatably and slidably fitted in a stuffingl box 11 provided in the head or end plate 2. The shaft 10'is rotated and reciprocated by any suitable power mechanism andgearing.` At itslower end the shaft 10 has secured thereto a spider 12- having a hub 13 fastened by nuts 14 to -the shaft 10 and havlng radial arms 15 terminating in scraper blades 16, the scraper blade 16 being extended angularly with respect to the splder arms.

Wire brushes 18 are fixed to the spider arms 15 and project beyond the outer ends thereof.

When the shaft 11 is -rotated and recipro-l cated both the scraper blade land the wire brushes 18 operate to remove the excess solids from the inner layer 5 ofthe filtering means.

The excess solids so removed fall down into the slude chamber 3.

The sludge chamber 3 has a lateral 0H'- take pipeI 20 communicating therewith, and

in this off-take pipe v20 a spiral conveyor 21l is o eratively mounted. rFhe conveyor 21 exten snot only through the o-take pipe, but' also acrossthe bottom 'of the'sludge chain-- ber.- The spiral conveyor 21 is mounted on afshaft 22 driven by chain and sprocket gear-4 'ing 23 from any suitable source of power.

tr'olling the discharge in such manner as to prevent loss of pressure from the ltering tank 1 and this means consists of a balanced valve 26 cooperable with a valve seaig formed Within the discharge fitting at the end of the olf-.take pipe 20. When the valve l26 is closed it prevents discharge through the discharge opening 24, Onl one side the valve' is subjected' to pressure of the tank'l exerted through the sludge in the off-take pipe 20 and the oppositev side of the valve is also' subjected to the pressure inl the tankl 1 by virtue of the provision of a pipe 28 leading from'the tank 1 into' the cylindrical eXtension 29 of the discharge fitting 25. lt is in this cylindrical extension 29 that the Valve 26 is slidabljy fitted. The Valve 26 is preferably of the piston type, and has a plurality ofpc- `.ripheral grooves 30 which are adapted to contain piston rings for holding pressure that comes through pipe 28 against baclr of valve, Lubricantis suppliedv through feed tubes 31v from a lubricant supply cup 32 to the cylinder 29.

lt may be desirable to subject thev valve 26 to pressure over and beyond that existing in i the tank l, and again it maybe desirable to positively close this valve 2li, The present invention provides means for accomplishing 'thesepurposes, and preferably such Ineens consists or a shaft E having" a screw threaded portion 3@ operativelyengaged with a nut or threaded bearing' 37 provided `in `a` cap 38 iastened to the cylindrical extension 29 of tlle discharge tting 25, it its outer end; shaft. 35 has a hand Wheel 39 lined thereto'. .l t its inner end the shaft 35 is slide-bly fitted an o eninrf d0 rovided in the ade-cent end of the Valve 26. A collar ll is to an intermediate portion of the shalt 35 and serves as an abutment for one end of a coil spring 42, the opposite end the spring l2 abetting the adjacent end of the Valve 2d., slieit 35 may be turned to cause the abut* scent il to place the spring l2 under del le tension, When e spring' l is under i'- pressure saine, Moreover when the shaft 35 is turned to a certain predetermined extent its inner end the Wall of the open l0 to positiifely :torce the Valve 2@ against its seat 2'3"., f The sludge discharged through the openfa-lls into a sludge Vat 5) from which niej, be discharged by a power operated and screw conveyor 5l through a Valve controlled discharge orifice 52 into a hopper 53 of' e washing and steaming unit 54. The Washing and. steaming unit com rises a closed tank or chamber 55 with Wiich the hopper connects through a valve controlled pipe 56, Steam may be supplied into the chamber through a valve controlled steam supply pipe 57.. The fluids pass out through a' ltrate pipe 58 after passing through filter ing means 59. The Washed solids may be inst the valve 2t? which tends toclose the carried oil' by l power operated screw conveydrs 60 througha valve controlled discharge 6l. v

I claim ze.

l. .A filter including a closed lteringv chamber, filtering means therein, means for supplying fluid to be filtered to the chamber, means for cleaning ofi" the excess solids from the filtering means, means for discharging said solids, having a discharge outlet, a Valve cooperable with the outlet for controlling the discharge of the solids, one side of the valve y beingsubjected -to the pressure within the chamber exerted through the solids being discharged, nieans for subjecting the opposite side of the valve to the pressure within the chamber, and *,fieldable means tending to close thc valve.. p y

2. Alilter including a closed filtering chamber, filtering means therein, meansfor supplying the liuid to be filtered to the chamber, means for cleaning od the excess separated solids frointhe filtering means, means for disvchanging said solids, and a balanced valve controlling said discharge, said balanced Valve being subjected on one side to the pressure within the chamber exerted through the solids being discharged, and means for subjecting the other side of Valve to the pressure Within the chamber.,

3. il. filter including a closed filtering chamber, ltering means therein, means for supplying the liuid 'to be filtered to the chamu ber, means for cleaningfoile the excess sepa-v controlling` said discharge, seid balenced vulve being subjected on one side to the presu sure AWithin the chamber' exerted through the solids discharged, and means for subjecting the other side'of the valve to the pressure the chamber, and means for supplying additional pressure to said other side yto tend to force the valve to closed position,

5. il. lter including a closed filtering chamber, liltering means therein, meansfor supplying theuid to be ltered to the chainber, meansy for cleaning oil" the excess separatedy solids from the filtering means, means for discharging said ysolids, a balanced valve controlling said discharge, said balanced valve being subjected onone side to the presditional presure to said other side to tend to :force thevalve to closed posit-ion, andmeans for closingsaid valve.

6." A filter including a closed ltering chamber, ltering means therein, means for supplying the fluid to be filtered to the chamber, means for cleaning off the excess separated solids .from the filtering means, means for ydischarging said solids, a balanced valve controlling said discharge, said balanced valve being subjected on one side to they pressure Within the chamber exerted through the solids being discharged, means for subjecting the other side of thevalve to the pressure v Within the chamber, an adjustable shaft,

means for adjusting the shaft, a spring engaged with the valve, an abutment for said spring cont-rolled bythe shaft whereby the spring may be tensioned Ato subject the valve vto the desired closingforce, one end of said shaft being positively engageable with the -valve to eect positive closing thereof in certain adjustments of the shaft.

7.. A -iilter including l a closed filtering chamber, filtering means therein, means for supplying the fluid to be filtered to the chamber, means for discharging the solid filtered out by theltering means, a balanced valve cont-rolling said discharge, said valve being subjected on. one side tothe pressure Within the chamber exerted through the solid being discharged, means for subjecting the other side of the valve to -the pressure Within the chamber, an adjustable shaft, means for ad justing the shaft, a spring engaged With the valve, means controlled by the shaft whereby the springfmay be tensionedtosubjectthe valve to the'desired closing force, one'end of the shaft being positively engageabl'e With the valve to effect positive closing thereof in certain adjustments of the shaft.

CHARLES ST. CLAIR BURNS. 

